Tests: Eliminate unnecessary files and variables.

1: The CTestTestFailedSubmits tests do not need to run the
   CTEST_MEMCHECK command. It is covered by the CTestTest2
   test. If more coverage *is* required, choose a test that
   runs by itself once to add it to... This one gets used
   several times in a loop to test submission failure via
   the various submission protocols. With memchecking on,
   each test here takes 1000 seconds or more on a "fast"
   build...

2: Other ctest tests do not need any of the CTEST_MEMORYCHECK_*
   variables defined. They don't even call CTEST_MEMCHECK, or
   -D NightlyMemCheck, or anything. So: remove the unnecessary
   set calls.

3: CTestTest3 has gone intentionally unused for months because
   it did not add any coverage and caused no ends of sporadic
   randomish failures when network connectivity was spotty.
   Remove its directory. Never add it again.

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